Juston Roy Graber was born in Buffalo, New York to Lori (Brennan) and Roy A Graber, who worked as a construction worker/roofer. Juston's father always stressed the importance of education, however, Juston did not attend college until later in life.

As a child, Juston never found it difficult to make others laugh, even if it meant at his own expense. His outgoing personality craved the spotlight. His natural comedic and dramatic qualities are what attracted Juston to the entertainment industry. His close friends helped to spark Juston's interest and pursuit in acting as a career. They all agreed that his personable traits, along with his discipline, fellowship, genuineness, and even goofiness, might elicit even greater abilities as an actor and establish a solid foothold in a rough, but promising business.

After a short, eight year, stint in the Army, Juston painstakingly dove head-first into theatre training. Beginning his journey at the Savannah College of Art and Design and eventually ending up at the University of Southern California where he earned a Bachelor of Arts in Theatre.

Throughout Juston's formal training, his love for improvisation generated at the Savannah College of Art and Design. He immediately sought out workshops run by fellow students at both SCAD and USC. Juston underwent improv training once he moved to Los Angeles in 2014. He trained through reputable courses at the Upright Citizen's Brigade, Second City Hollywood, and, of course, USC. Juston's love for improv led him to become a co-founder, alongside Casey Dunn, of prettyNOTbad comedy squad - one of seven improvisation troupes at the University of Southern California. Juston continues to perform improv with the team Hurry Up'n Wait, a troupe entirely comprised of United States military veterans.

Juston has been and continues to be involved in numerous independent films, theatrical productions, improvisation, voice acting, and even dabbles in musical theatre. He has proven to consistently exemplify his skills as an actor by stretching outside of his comfort zone through investing time within his professional training and by playing a variety of characters in film, television, and theatre.​